*{padding: 0;margin: 0;}
h1{
    font-family: "微软雅黑";
    font-weight: normal;
    text-align: center;
    height: 49px;
    box-shadow: 0px 2px 4px gray;
}
ul{
    list-style: none;
}
.main .center-nav ul li.item{
    float: left;
    width: 20%;
    text-align: center;
}
.main .center-nav ul li.item img{
    margin-top:10px;
    margin-bottom: 3px;
}
.urls-nav .urls{
    border-bottom: 1px solid gray;
}
.urls-nav .urls li.url{
    float: left;
    width: 20%;
    text-align: center;
    height: 45px;
    line-height: 45px;
}
.urls-nav .urls li.url a{
    color: black;
    text-decoration: none;
}
.urls-nav .urls li.urla{
    float: left;
    width: 20%;
    text-align: center;
    height: 45px;
    line-height: 45px;
    font-size: 14px;
}
.urls-nav .urls li.urla a{
    color:gray;
    text-decoration: none;
}
.foot{
    float: left;
    width: 50px;
    text-align: center;
    height: 30px;
    line-height: 30px;

}
.footer-nav{
    width: 250px;
    margin: 0 auto;
}
.foot a{
    color: white;
    text-decoration: none;
}
.footer{
    background-color: black;
}
p{
    text-align: center;
}